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post #166 of 3704
Very much enjoying the synergy between the HM-801 and the TU-05/PF combo.

There is an ease to the music that keeps one listening that goes beyond my previous set up. I know it is often said of good digital that it sounds analog but this really does. Last night listening to the Davis/LSO recording of Verdi's Requiem the beginning, Requien Aeternam is sung at a hush and on pretty much everything apart from live that I have heard sounds like voices murmuring but with the 801 in the mix everything is discernible including intakes of breath. Never have I experienced the level of emotion in this pieces as I did last night apart from live and with a very high end speaker set up. I just thought it was a victim of the limits of headphones and portable audio, not the case any more!

I would be very interested Andy to hear your thoughts on the Terra/TU-05 combination, I have a feeling both players have more in common than apart in terms of musicality.
post #167 of 3704
Quote:
Originally Posted by ianmedium View Post

Very much enjoying the synergy between the HM-801 and the TU-05/PF combo.

There is an ease to the music that keeps one listening that goes beyond my previous set up. I know it is often said of good digital that it sounds analog but this really does. Last night listening to the Davis/LSO recording of Verdi's Requiem the beginning, Requien Aeternam is sung at a hush and on pretty much everything apart from live that I have heard sounds like voices murmuring but with the 801 in the mix everything is discernible including intakes of breath. Never have I experienced the level of emotion in this pieces as I did last night apart from live and with a very high end speaker set up. I just thought it was a victim of the limits of headphones and portable audio, not the case any more!

I would be very interested Andy to hear your thoughts on the Terra/TU-05 combination, I have a feeling both players have more in common than apart in terms of musicality.

 

Very nice. Sadly I still couldn't test the A2P. There were some issues so I couldn't get the amps before my holidays. I'll get the demos next month after I come back instead.

post #168 of 3704
Just scored a pair of ultra rare NOS Siemens 1T4's..

Anyone else fortunate enough to have purchased this amp yet. As it gets more hours on it the sound is just sublime. I have the perfect pairing of all equipment for my ears and tastes in music.

I especially love early vocal music (14th/15th/16th Century) and this combination excels at portraying not only the delicate and at times complex vocal harmonies but it captures the acoustic they are recorded in (usually chapels/churches or ancient buildings) perfectly!
post #169 of 3704
New headphones arrived today for the TU-05 and they are a lovely match (though there is burn in still to go). Very happy with the synergy.

T5P
post #170 of 3704

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Edited by seeteeyou - 11/4/14 at 11:35pm
post #171 of 3704
You know, I can't say about your headphone choice as i have never heard them though the impedance is fine with the amp. As to cables, though I do find a small difference I would not spend more than say someone like Toxic cables charge as much above that I feel would be better spent on better phones!

I would imagine the Terra would be a wonderful combination with the amp, I am sure smial1966 will confirm that.

I have found as long as impedance is right the '05 works will all my headphones really well. The sonic signature is pretty neutral I find. Though it is a class A SET it has a very non existent quality like all good amps should have!


You will find yourself exploring tubes as they are compared to ones you need in other amps pretty cheap and it is fun.

I have just won a set of beautiful British Marconi's on ebay. I must admit, I half got them for the looks though the research I have done says they are beautiful sounding!


post #172 of 3704
Photo Tutorial On Preparing NOS Valves/Tubes

I thought I would do a photo tutorial on how to get the best out of your NOS tubes before using them in the amp. I have found that a small amount of time and effort at this stage yields great dividends later on in terms of lowered noise floor.

So, if a tube is NOS/NIB why do we need to clean the pins? Well, after decades of sitting on shelves in sealed cardboard boxes oxidization occurs as the boxes allow air and moisture in. I have only found one set of tubes so far than suffered no oxidization. All the rest did and as you will see in the pictures quite a bit builds up over the decades.

The tubes being shown just arrived today. Rare Seimens from the early 1950's. The boxes had never been opened as was evident by the staples still holding the box top sealed.

So, this is what greets you when you open up that virgin box!

The glass has a slight residue on it from years of moisture/drying even though the box was sealed!


And this is the result of years of sitting on shelves in boxes in environments with temperature changes. The oxidization is self evident!


So, what do you need to get these pins shiny bright and ready to produce you beautiful music? Tools are simple and cheap. 99% or better de-natured alcohol such as you find in pharmacies, A Q-tip and a two in one nail buffer. A soft terry cloth to do the work on (I find terry better as the loops tend to not allow the tubes to roll! Not in the picture is a micro fibre cloth such as you use for spectacles which is used to gently clean the glass (don't use liquids as they take off the printing on the glass!)





On with the cleaning!

Cut about 2cm off the end of the nail buffer and then cut that into three narrow strips, you'll see why in a minute! With the green side of the buffer start to GENTLY buff the outside of the pins like so..


You need to apply virtually ZERO pressure with the buffing, just take it slow and keep turning the tube as you go. You will find that you will be cleaning two pins at once this way and I find that gentle forward motion strokes to be the best when buffing ( remember, your aim is to only remove the oxidization, not the metal!) Eventually you will see the oxidization removed, it is then that you turn the buffer over and use the other side which has no real texture to it at all. When you buff with this side it removes the last traces of oxidization and also slightly polishes the pins. To know this is working properly you will hear a slight squeaking noise as you repeat the motions you used in the other stage.


To do the inside of the pins is a little more involved but essentially the same process as the outside but it is here where the little strips of nail buffer come into play. Gently rub the inside and sides of the pins with the buffer. You want to do vertical strokes from the base of the pin to the end of the pin, again, one way is best though of course when you re-insert the buffer it will rub against the inside of the pin a little. This is to be done with even more care! Just repeat the steps used for the outside with the slightly modified technique.
Here is what it should look like! Again, you will be doing two pins at a time.


And this is what is removed from the pins.. Look at all that awful black gunge!


Once you are satisfied you have removed all the oxidization (you may notice pits in the metal, that is fine) then with a Q-Tip dipped in alcohol clean the pins and base so as to remove any last traces of debris or grease from the cleaning process. If it is 99% then it will dry almost immediately!


And so your done! See those pins gleam! Ready to give noise free service for years to come and remember, its not only about the noise.. Imagine those grungy looking pins in your pristine and expensive amp, you would not want to treat your pride and joy in such a cavalier way now would you! eek.gif

post #173 of 3704

ianmedium,

 

A superb pictorial guide to cleaning oxidized pins using inexpensive everyday household items. Quite literally brilliant!

 

Cheers,

 

Andy.

 

P.S. Have you listened to the DF91 yet?  

post #174 of 3704
Thanks so much Andy.

I had a good long listen last night. Once I had cleaned the pins I left the amp playing music for 3 hours and then last night listened for another three.
As I have said previously I feel NOS tubes need a good ten hours on them before the settle down and lose the light ting ting sound when tapping the case or turning the volume. Likewise they can sound lifeless in that time.

This was the case with these but in the course of last nights listening I got to experience the change as it happened!

By the end of the evening the tubes fell inky black silent when no music was playing with only the faintest ting noise present. I feel confident that will be gone by the end of the day.

What was more wonderful was to hear the transition from lifeless to richness and incredible detail. At first I thought the were just analytical tubes but at the end of the evening they are detail retrieval kings but at the same time so musical and rich. Bass became deeper and more defined and the feeling of the acoustic space so palpable.

Alison Krauss is always a real litmus test for me. Bad equipment makes her voice sibilant, flat and harsh. Good equipment reveals a breathy, emotive voice rich with texture and tonal range. By the end of listening last night that was not only present but simply the best I have heard on any of the portable set up's I have listened to, heck it is up there also with my benchmark, the Nagra/Wilson system.

I am really looking forward to your thoughts on these but for me the beat the Lorenz's, just! They not only have the air, delicacy and detail retrieval of those but add a little more depth and bass which in combination with the Mullards driving gives one an holistic and richly textural experience. My gut tells me your Terra and my 801 are musical siblings so I feel you will get a similar experience

Btw, this was all done with my new T5P's which are proving to be (with continuing burning in) beautifully musical and involving headphones with good, tight bass, grain less top end and mids so similar to my PF's which means the best out there!
Edited by ianmedium - 3/29/13 at 5:47am
post #175 of 3704
You know, I take it back, the Siemens are great but I think I still prefer the Lorenz's just because they are just that tiny bit more silent. It's not huge and if i did not have them I would be fully immersed in the Siemens and we are talking tiny difference here!
post #176 of 3704

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Edited by seeteeyou - 11/4/14 at 11:35pm
post #177 of 3704
I am sorry, I am not sure what your meaning with this suggestion? Do you mean to use these to replace the headphone socket on the amp?

If so and the WBT ones replicate the one on the amp presently ( on /off and headphone out ) then those WBT's look really substantial and I like them a lot

I had a slight issue this week with my socket. When I took my amp to my local HiFi store to try the beyers the beyers 3.5mm jack bent the connector slightly so it ended up springing out!

It was a very simple fix. I opened the case and gently bent the end of the connector back into shape with needle nose pliers, it's actually a nicer connection now than originally!

I know Shikada San is working on this issue and is keen aesthetically to keep the on/off/ headphone jack solution

When I spoke to my HiFi dealer he said the main reason most higher end amp makers use the 6.4 jack is that very few 3.5mm are the same, much greater chane for slight variables in size apparently.
Edited by ianmedium - 3/30/13 at 6:57am
post #178 of 3704

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Edited by seeteeyou - 11/4/14 at 11:35pm
post #179 of 3704
Hmm, I am just thinking of the headphone jack and that is a tight squeeze in there with the Transformer being right next to it but the look of the ones you show look much better and more substantial. I think unless it becomes a warranty issue for me and I have to send the amp back to shikada san I will just leave well alone with how it is for me now as I actually love how easily and securely the jack fixes into the socket since I did my minor adjustment.

From day one I have used a mini extension cable rather than directly plug in my headphones apart from this one time.. Looks like my caution paid off! Though I do think this is something than needs to be addressed and I know after speaking with Shikada san a few times he is working on a solution.

I suggest a metal toggle switch for on/off and just leave the headphone socket as just that but he prefers the aesthetics of no switch. Given the choice I would take the switch option any day for reliability and I think a nice vintage looking toggle switch under the volume would be in keeping with the looks!
post #180 of 3704
Firstly. A plea to other TU-05 owners. It would be so lovely if you would share thoughts on your amp here. I feel like I am a lone voice and it would be great for others who own this amp to give their views!

If you agree with my thoughts on the amp great! If not, great as well! It just helps others who might be interested in purchasing this amp come to a balanced decision and will ensure hopefully Shikada Sans continued success as I feel he really deserves it.

So, end of the preach, I am going to drone on once more but this time about a tube, not the amp!

As you all know I have purchased a whole bunch of tubes these past few months. All have been lovely tubes and I would be satisfied with any of them in the amp. However, one in particular really stands head and shoulders of the rest, The Lorenz 1T4. Now, I am not ignoring the Mullard in the power section, it has an essential part to play but I feel the tube that has the most profound effect is the Lorenz. This really has come home to me this week after getting the excellent Siemens 1T4's and comparing them with the Lorenz and Mullard equivalents.

So what is it about this ultra rare tube that sets it apart you ask?

It really came home last night after listening to the Siemens, then switching over to the Mullard then finally to the Lorenz. The Siemens is an excellent tube for detail retrieval as well as spaciousness around the notes and also soundstage. What it gives up a little in pursuit of that is warmth and depth and a little texture.

Now the Mullard really excels at smoothness. It makes everything creamy and delicious but it does not go to the depths of micro detail retrieval that the Siemens does and so though more relaxing a tube it also feels a little un-involving.

So that brings me on to the Lorenz..

After my past few comments here last night I decided to have a really detailed listen as I have said and I realized what it is about these tubes that make them so extraordinary.

They manage to not only feel smooth and creamy but at the same time go beyond the Siemens in terms of micro detail retrieval. Things like guitar strings plucked, one can hear the texture of the finger tip on string with these, it is lost with the other two. Things like the double bass line on Dave Brubecks time out which is very quiet and in the middle of the mix is brought forward slightly so that one can hear it a little more, hear the notes played a little easier.
On the excellent Davis/LSO Verdi Requiem the Requien Aeternam which is sung at a hush that can seem like a hum or murmur with most equipment and with the Mullards and Siemens takes on an incredible beauty with the Lorenz's. Even though so quiet one can hear the inhale of breath from the male chorus singers.

The delicacy of this piece is fully resolved and conveyed only in my experience with the Lorenz tubes. Don't get me wrong, it sounds lovely with the other two but one strains to get near the level of detail with which the lorenz portrays effortlessly this beautiful and emotional piece.

In summary, these tubes convey texture and emotion like no other. Also, one other thing they do is a greater soundstage. Instruments and voices within the acoustic have much more space to breathe. Likewise one senses the scale of a full orchestra far more easily with these tubes it being much easier to place the different sections of the orchestra in the acoustic.

Combine these with the weight and warmth of the mullards driving the music and I feel one has the best of all worlds. I am going to do one more experiment though. I think I may have sourced a pair of the DL92 versions of the Lorenz's. If I have I will place and order and lets see what that does!

My biggest regret with this though is that the rest of you will have great difficulty in experiencing what I am due to the ultra rare nature of these tubes. I keep a daily eye out though and if I find any more I will be sure to post here the details.

So folks, come on, lets hear your thoughts on this amp. I really want to hear what you feel about it!

To finish, a close up of this wonderful tube!

AppleMark
Edited by ianmedium - 3/30/13 at 6:49pm
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